Machine for making pulp cylinders



(No Model.)

F. L. BARTLETT. MAGHINE FOR MAKING PULP GYLINDBRS.

No. 447,455. Patented Mar. 3, 1891.

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UNITED STATES FRANK L. BAR-TLETT, OF PORTLAND,

PATENT OFFICE.

MAINE.

MACHlNE FOR MAKING PULP CYLINDERS.

SPECIFIGATION formng part of Letters Patent No. 447,455, dated March 3, 1891.

Application filed April 7, 1890. Serial No. 346,809. (No model.)

To all whom it may concern:

Be it known that I, FRANK L. BARTLETT, a citizen of the United States, residing at Portland, in the county of Ouinberland and State of Maine, have invented certain new and useful Improvements in Machines for Making Pulp Cylinders; and I do hereby declare the following to be a full, clear, and exact descriptien of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

Hy invention relates to centrifugal maehines for forming cylinders of pulp or other like material The object of my invention is to overcome certain obsta'cles which have existed in the machines as hitherto made7 particularly when applied to the manufacture of small tubes, and my invention is directed to the remedying of these diflficulties, as will be hereinafter pointed out.

These maehines as heretofore Constructed have not been automatic and have required the close attention of the operator. There has also been considerable difficulty experienced in distributing the pulp uniformly throughout the length of the tube and in securing abore of uniform and definite size each time. I correct these defects according to my presentinvention by inserting centrally within the centrifugal cyliuder a non-rotating pulp distributing or supply tube having lateral openings throughout its entire length, whereby the pulp is evenly distributed, the supply automatically cut off, and the cylinder filled up solid to the core or pulp-supply pipe. Again, it has been diliieult to handle tubes made on these machines when in the moist condition in which they come from the machine, and particularly when they are of anv considerable length, and when taken out and dried they have always had a tendency to warp or dryout of shape. l overcome this by inserting within the outer eylinder a rigid inner tube made of finely perforated metal plate. This tube is supported in such a manneras to leave a drainage-spacc between it and the outer cylinder, The pulp Cylinders are formed, taken out, and dried in these perforated tubes, of which a large number are provided for each machine, One machine is also enabled to form a great number of different sizes by using the above-mentioned perforated sheet-metal tubes of different sizes supported within the main eylinder by ringe or collars of suitable size.

My invention consists of the various features which I have pointed out and other subordinate features, all of which will be elearly pointed out in the claims.

I have illustrated a simple form of machine embodying my invention in the accoinpanying drawings, in which- Figure l is a central vertical longitudinal section. Fig. 2 is a section on :t cc of Fig. 1, looking toward the right. Fig. 3 is a side ele- Vation showing the perforated sheet-metal tube with one ring or collar in position, and Fig. .JC is a detail of cleaning-rod used in the pulp-supply pipe.

A is a head secured to the end of a shaft A', only a portion of which is shown, said shaft being journaled in the bearing o. The shaft A' is driven by a pulley or by any otherwellknown means, which it is not necessary to show.

Secured to the head A is an outer cylinder B, the opposite end of which is supported in any suitable manner. As here shown, Isupport it in a bearingD, in which is an Opening to admit the end of cylinder B. Bearingblocks cl are secured to the bearing D, and these impinge against the ring c, fixed on the end of the eylinder B. A cap C eloses the end of the cylinder. This cap has a central Opening, through which passes the pulpsupply pipe F, making a joint which is nearly or quite water-tight. This pipe extends the entire length of the machine and its inner end has a bearingfin the center of the head A. In the sides of the tube F and extending throughout its entire length are numerous pulp-openings f' f', by which the pulp is evenly distributed along the cylinder. In place of separate holesI may use a longitudinal slot with good results.

Between the supply-tube F and the outer cylinder D is a perforated cylinder E, in which the pulp-tube is formed. This is a tube of fiuely-perforated sheet metal. I find tin very well adapted for this purpose. This tube E is inserted into the cylinder, and is held in such a position that there will be a drainagespace between it and the enter eylinder. I

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Vfrom obstructions.

entire length of the pulp tube, and on the endprefer to support the tube E by means of a series of rings or collars, `as c, which are slipped on over it and are just large enough to enter the cylinder B. They may or may not be soldered or otherwise fastened to the tube E. The outer end of the tube F is provided with a T-connection G, by which it is preferably connected with a pulp-supply by means of a flexible pipe g'. A valve g governs the supply of pulp. The end of the T- connection G is provided with a plug 92, through which is an Opening which admits a cleaning-rod h, by which thetube is kept free This rod h extends the of the rod h is an offset i.

The connection G is supported by a standard 93, which may be removably secured to the bench H in such a manner as to slide longitudinally when thetube F is drawn out. A simple means is that here shown, which consists of a bolt q4, passing through a slotin the bed I-l, by means of which the standard 93 may be slid back and the supply-pipe withdrawn from the machine. A packing-ring]02 is placed on the pipe F outside of the cap O to secure it against the chance of leaking.

The Operation of the machine is as follows, viz: The parts being in the position as shown in Fig. 1, the pulp is admitted through the supply-pipe and distributes itself throughout the whole length of the tube E. In practice it is found that there is no noticeable difference in. thickness between what is deposited at the lower and the upperportions of the tube, for as soon as the deposit reaches a certain thickness depending upon the pressnre water practically eeases tof pass through, If there is anydifierence, the tendency of the pulp when rotationbegins is to deposit most freely on' the thin places, and thus equalize the thickness. As soon as the tube E is full of pulp the machine is rotated at full speed and the pulp is deposited on the walls of the tube E, which gradually fills until the pulp reaches the supply-pipe, when it closes the holes f' and stops the supply. As soon as the pulp formed is dried out somewhatit shrinks away from the center and admits a supply of fresh pulp through the holes f', and so keeps on alternately fiowing and stoppin g until a solid tube is formed having the pipe F for a core. It will thus be seen that the action of the. machine is entirely automatic and requires no watching after the pulp is turned on. When the water ceases to be thrown from the pipe B, the pulp is shut off, the tube F with-. drawn, the bolt 94 having previously been loosened. The cap O is then taken ofi, and the tube E is pulled out and put away in a dry room with the pulp tube in it, until the latter is dry.

During the process of drying, the pulp will be held in shape and prevented from warping, and when dry it will shrink just enough, so that it may be slipped easily from the tube.

Lest the supply-pipe become clogged, as it' is liable to do, the rod h can be moved back and forth occasionally, sol that the holes f' Will be kept clear and free.

By means of rings c of suitable size I am enabled to use in asingle machine having an outer cylinder of suitable size many different-sized tubes and to form many sizes of pipe-a thing which has not hitherto been done on'one machine. It is not important that the outer cylinder B should be perforated with numerous holes when the space between it and the tube E is considerable, as the Water may be discharged' through one or two holes suitably located. These perforated tubes E, when made of tin, can be made cheaply, and a large number of them provided of varying sizes. It is not necessary, as I have found, to line them with wiregauze, felt, or other pervious material, the perforated metal itself being sufficient to retaiu and lay the pulp.

I claim-f 1. In a centrifugal machine for forming pulp cylinders, a rotating outer perforated tube, au inner perforated tube of smaller diameter secured concentric therewith to form a drainage-.space between said tubes, and means for supplying pulp to said inner tube, in combination, substantially as described. i

2. In a centrifugal machine for forming pulp cylinders, an outer perforated tube, an inner perforated tube concentric therewith, and annular rings or collars for separating said tubes, iin combination, substantially as described.

3. In a centrifugal machine for forming pulp Cylinders, a rotating pervious tubeand a non rotating pulp-supply pipe fixed centrally therein and having pulp openings throughout its entire length, in combination, substantially as described.

4. A pervious cylinder, a pulp-supply pipe extending centrally through it, aT orbranch at the outer end of said pipeconnecting with IOO IIO

a source of supply, a plugin the end of said FRANK L. BARTLETT.

Witnesses:

S. W, BATEs, E. T. FOLEY.

IIS 

